<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }

        .menu {
            width: 100%;
            height: 100px;
            /*行高与高度一致 居中*/
            line-height: 100px;
            /*设置display: flex;会让块级标签变为行级标签*/
            display: flex; /*设置弹性盒  低版本需要兼容处理*/
            font-size: 40px;
            position: fixed;
            bottom: 0;
        }

        .menu li {
            list-style-type: none;
            width: 20%;
            text-align: center;
        }
    </style>
</head>
<body>
<!--ul和li都为块级标签-->
<ul class="menu">
    <li>菜单项1</li>
    <li>菜单项2</li>
    <li>菜单项3</li>
    <li>菜单项4</li>
    <li>菜单项5</li>
</ul>
</body>
</html>